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Retirement Benefits Plans (Amounts Recognized as Components of Other Comprehensive (Loss) Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reclassifications to earnings of:
Prior service benefit amortization	$ (0.1)	$ 0.0	$ 0.1
Retirement benefit plan funded status adjustments:
Actuarial (losses) gains	1.6	0.7	(0.6)
Total	(0.1)		0.1
Postretirement benefit plans
Reclassifications to earnings of:
Actuarial loss amortization	0.7	0.6	0.6
Prior service benefit amortization	(0.5)	(0.6)	(0.7)
Retirement benefit plan funded status adjustments:
Actuarial (losses) gains	(2.0)	(1.0)	0.8
Total	$ (1.8)	$ (1.0)	$ 0.7

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- Definition

Other comprehensive income loss amortization pension and other postretirement benefit plans actuarial loss amortization recognized in net periodic pension cost net of tax.

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Amount, after tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.

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Amount, after tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

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